# Determine modulation index of an FM carrier having a frequency deviation of 25 kHz and modulating signal of 5kHz.

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Determine modulation index of an FM carrier having a frequency deviation of 25 kHz and modulating signal of 5kHz. Also determine carrier swing.

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Δf = 25 kHz, fm = 5kH
m = $\frac{\Delta f}{f_m}=\frac{25}{5}=5$
Carrier swing, Cs = 2.Δf
= 2 x 25kHz
= 50 kHz